Evaluate
M\left(2n+M\right)
Expand
2Mn+M^{2}
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M^{2}+2Mn+n^{2}-n^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(M+n\right)^{2}.
M^{2}+2Mn
Combine n^{2} and -n^{2} to get 0.
M^{2}+2Mn+n^{2}-n^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(M+n\right)^{2}.
M^{2}+2Mn
Combine n^{2} and -n^{2} to get 0.
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